CN100398684C - Superhigh strength X100 pipeline steel and its hot rolled plate making process - Google Patents
Superhigh strength X100 pipeline steel and its hot rolled plate making process Download PDFInfo
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Abstract
The present invention relates to pipeline steel, and is especially one kind of superhigh strength X100 pipeline steel and process of making hot rolled plate of the X100 pipeline steel. The superhigh strength X100 pipeline steel consists of C 0.015-0.080 wt%, Mn 1.80-2.50 wt%, Si not more than 0.6 wt%, S not more than 0.0030 wt%, P not more than 0.015 wt%, Nb 0.04-0.15 wt%, Ti 0.005-0.030 wt%, V not more than 0.120 wt%, Alt not more than 0.060 wt%, N not more than 0.010 wt%, O not more than 0.006 wt%, Mo 0.10-0.60 wt%, Cu not more than 0.50 wt%, Ni not more than 1.50 wt%, Cr not more than 1.0 wt%, B not more than 0.0020 wt%, Ca not more than 0.01 wt%, and Fe and inevitable impurity for the rest. The rolling process of making hot rolled plate has plate blank heating temperature of 1100-1250 deg.c, final rolling temperature of 720-880 deg.c, final cooling temperature of 200-500 deg.c and cooling speed of 3-30 deg.c/s.
Description
Technical field:
The present invention relates to a kind of pipe line steel and manufacture method thereof, particularly a kind of superhigh strength X 100 pipeline steel and hot rolled plate making process thereof.
Background technology:
The variation of energy structure in recent years and to the growth of energy demand has greatly promoted long development apart from line of pipes.For improving transport efficiency, reducing construction investment, length has become trend with steel to high grade of steel development apart from the petroleum gas delivering pipe line.At present the highest grade of steel in the pipe line steel standard used of countries in the world only arrive X80 (yield strength is more than or equal to 555MPa), for the X100 (the yield strength grade is more than or equal to 690MPa) that satisfies following long development need superstrength grade apart from the transfer oil NG Pipeline Construction and X120 (the yield strength grade is more than or equal to 830MPa) pipe line steel develop develop among.The pipe line steel of present relatively X80 and the following grade of steel of X80, use operating pressure that X100 grade high-strength pipeline can improve conveying improving the efficiency of operation of pipe-line transportation, or under the constant situation of transfer pressure, reach the purpose that reduces the pipe-line construction cost by reducing pipeline wall thickness.U.S. Pat 20030217795 has mainly been set forth the production method of X100 line pipe and the salient features of the line pipe produced.Wherein, the steel plate composition and the technology that are used to make the X100 pipeline steel tube provide, but on composition mainly based on low-carbon (LC), attached with alloying elements such as Mo, Cu, Ni, B.What is particularly worth mentioning is that main technical point in this patent is to utilize the oxide compound metallurgy action of Mg to improve the welding property of body.Japanese Patent JP 2003306749 A have mainly set forth the X100 steel pipe and have made the steel plate manufacture method of steel pipe with it, point out oxide compound and nitride metallurgical method crystal grain thinning in the composition of its X100 pipeline steel plate, and adopt the design of C-Mn-Ni-Cr-Mo-B set member with Mg and Al.Though when steel-making, adopt the method for oxide compound metallurgy to enhance product performance, also increase the complicacy of cost and manufacturing.Japanese Patent JP 2001113374 A provide the production method and the principle of the X100 line pipe of a kind of tensile strength more than 900MPa, focus on steel pipe weldprocedure aspect, and welding is easier to realize, and has good low-temperature toughness.It mainly pays attention to the mode of production and the method for steel pipe, although mention the composition design of X100 steel plate, mainly also is that the oxide compound metallurgical method with Mg improves welding property.European patent EP 1020539, its content and U.S. Pat 20030217795 are approximate.European patent EP 1354973 provides the API X60～steel plate of X100 pipeline steel tube and the manufacture method of steel pipe.Steel pipe has good deformation performance and low-temperature flexibility.The most average grain sizes of high tensile steel plate tool are less than the ferritic phase of bainite grain-size.Composition design method is provided, and C is based on low-carbon (LC), and impelling strength and welding property are poor slightly; Secondly, but the too high levels of alloying elements such as Mn, Mo, Cu will cause the raising and the increase manufacture difficulty of manufacturing cost, and will be unfavorable to the welding property of steel plate, be unfavorable for the resources effective utilization simultaneously.At last, the same with U.S. Pat 20030217795 in the composition design, add the Mg element, but increased manufacture difficulty.
Summary of the invention:
The purpose of this invention is to provide a kind of superhigh strength X 100 pipeline steel and hot rolled plate making process thereof.Mainly solve existing X100 pipe line steel prescription more complicated, production cost is higher, manufacture difficulty is big and impelling strength and welding property have insufficient technical problem slightly.Technical scheme of the present invention is: a kind of superhigh strength X 100 pipeline steel, the weight percent proportioning of its moiety is: C:0.015～0.080%, Mn:1.80～2.50%, Si :≤0.6%, S :≤0.0030%, P :≤0.015%, Nb:0.04～0.15%, Ti:0.005～0.030%, V :≤0.120%, Alt :≤0.060%, N :≤0.010%, O :≤0.006%, Mo:0.10～0.60%, Cu :≤0.50%, Ni :≤1.50%, Cr :≤1.0%, B :≤0.0020%, Ca :≤0.01%, all the other are iron and inevitable impurity.
High-intensity high-tenacity X100 pipe line steel composition design philosophy of the present invention is with ultralow C, high Mn, by adding microalloy elements such as micro-Nb, V, Ti, a small amount of Mo, B and Cu, Ni alloying element, in conjunction with the hot rolling cooling controlling and rolling controlling process, obtain bainite+acicular ferrite+second phase constitution, have the performance of high-intensity high-tenacity to guarantee pipe line steel.Its main fundamental element effect has the following aspects:
Carbon: be strengthening element most economical, the most basic in the steel, by solution strengthening and precipitation strength the intensity that improves steel there is obvious effect, but improve C content ductility, toughness and the weldability of steel had negative impact, thus modern age pipe line steel evolution be the process that constantly reduces C content.Reduce the toughness that C content helps to improve steel on the one hand, can improve the welding property of steel on the other hand.We know that pipe line steel can have good weldability when C content is lower than 0.11% according to the Graville graphic representation of C content in the steel, carbon equivalent and steel weldability relation.So the C content of current pipeline steel is generally less than 0.11%, it is the C content design of 0.015-0.080% that X100 pipe line steel of the present invention is then adopted C.
Manganese:, be that compensation reduces the main and most economical strengthening element that causes loss of strength in the pipe line steel because of C content by the intensity of solution strengthening raising steel.Mn still enlarges the element of γ phase region, can reduce the γ → α transformation temperature of steel, helps to obtain tiny phase-change product, can improve toughness, the reduction ductile-brittle transition temperature of steel.Therefore the Mn content to the X100 pipe line steel designs in 1.80～2.50% scopes.
Niobium: be one of topmost element in the modern microalloying pipe line steel, fairly obvious to the effect of grain refining.Separate out the austenitic answer of obstruction deformation, recrystallize by NbC strain inducing in the course of hot rolling, when making the rolling deformation austenite structure in non-recrystallization zone in phase transformation, controlled rolling and controlled chilling change tiny phase-change product into, so that steel has high strength and high tenacity.This patent is exactly to cooperate suitable C content to improve the effect of the content performance NbC of Nb.
Vanadium: have higher precipitation strength effect and more weak grain refining effect, when Nb, V, three kinds of compound uses of microalloy element of Ti, V mainly is by improve the intensity of steel with VC, VN precipitation strength in ferrite.
Titanium: be strong solid N element, the stoichiometric ratio of Ti/N is 3.42, utilizes the Ti fixing following N of 60ppm in the steel just about 0.02%, can form the TiN precipitated phase of tiny high-temperature stable when sheet billet continuous casting.Austenite crystal when this tiny TiN particle can hinder the slab reheat is effectively grown up, and helps to improve the solid solubility of Nb in austenite, simultaneously the impelling strength of improving welded heat affecting zone is had obvious effect.
Molybdenum: be to enlarge the γ phase region, separate out ferrite earlier when postponing γ → α phase transformation and form, promote the principal element that acicular ferrite forms, phase-change organization plays an important role to control, at certain cooling conditions with stop adding in the Ultra-low carbon pipe line steel under the rolling temperature 0.1～0.6% Mo and just can obtain tangible acicular ferrite and bainite structure, change to the low temperature direction because of phase transformation simultaneously, can make and organize further refinement, mainly be the intensity that improves steel by the phase transformation strengthening of tissue.
Sulphur, phosphorus: be unavoidable impurities element in the steel, it is low more good more to wish.By super low sulfur (less than 30ppm) and Ca processing sulfide is carried out inclusion morphology control, can make pipe line steel have high impelling strength and good resistance HIC performance.
Copper, nickel: can improve the intensity of steel by the solution strengthening effect, Cu also can improve the solidity to corrosion of steel simultaneously, and the adding of Ni mainly is to improve the red brittleness that Cu easily causes in steel, and useful to toughness.In thick specification pipe line steel, also can compensate the strength degradation that the increase because of thickness causes.
Therefore, have high-intensity high-tenacity and good welds performance at the micro-alloying low-carbon bainite structure, and low characteristics such as Bauschinger effect, based on material reinforcement theories such as grain refining, phase transformation strengthening, precipitation strength and dislocations strengthenings, the composition design with bainite structure X100 pipe line steel has been adopted the composition design of the Mo alloying of lower carbon content, super low sulfur, Nb, V, Ti microalloying, control tissue.Hot rolling technology has adopted the hot mechanical treatment technology of controlled rolling and controlled cooling, carries out the organizational controls of the finished product by reasonable component and technology, to obtain to have the ULCB+acicular ferrite structure of high-intensity high-tenacity.
The operational path of X100 line steel hot rolling board fabrication method is as follows: at first get the raw materials ready by the technical scheme proportioning, carry out converter or electrosmelting, external refining, casting, slab reheat, controlled rolling, controlled chilling then.Hot rolling technology carries out following control:
(1) slab heating temperature: 1100～1250 ℃;
(2) the rolling final temperature of recrystallization zone controlled rolling: 900～1060 ℃;
(3) the rolling beginning temperature of non-recrystallization zone controlled rolling: 800～900 ℃;
(4) stop rolling temperature: 720～880 ℃;
(5) stop cooling temperature: 200～500 ℃;
(6) speed of cooling: 3～30 ℃/s.
The present invention has following characteristics: 1. compare with above-mentioned patent of having applied in the past, the alloy formula of this patent is simple relatively, can add and not add as Cu, Ni, need not add the Mg element and carry out oxide compound metallurgy etc., reduce manufacturing cost like this and increased the production manufacturability; 2. it mainly is characteristics with the Ultra-low carbon, under the proof strength prerequisite, impelling strength and good welding property have been increased, make pipe line steel have good crack arrest ability, development along with the smelting iron and steel technology, the smelting difficulty of Ultra-low carbon pipe line steel further reduces, and can obtain the Ultra-low carbon pipe line steel by the endpoint carbon content of control smelting and the furnace outer refining process of RH at present; 3. made full use of the relation of C and Nb element, under certain cooperation, make it to generate NbC and produce the refined crystalline strengthening effect, and the raising recrystallization temperature of utilizing Nb is done in order to cooperate controlled rolling process, not only improved The comprehensive performance, and can take hot rolling production technique flexibly, boost productivity, reduce mill load, the product of being produced has higher impelling strength (Charpy-V impact power under 80 ℃ can reach more than the 200J), can fully guarantee high intensity and toughness, have good crack arrest ability.The pipe line steel X80 of the maximum intensity grade of having used with present pipework compares, and has improved 20% on intensity, and the construction cost that reduces transport pipe is had tangible effect.Contrast patent and composition of the present invention contrast see Table 1, and wherein patent 1-5 is successively corresponding to U.S. Pat 20030217795, Japanese Patent JP2003306749 A, Japanese Patent JP 2001113374 A, European patent EP 1354973 and European patent EP 1354973.
Compare with the existing steel grade (highest level X80) of producing, the performance of the pipe line steel of producing according to technique scheme reaches following requirement:
(1) tensile property: target: σ
0.5〉=690MPa, σ
b〉=780MPa; (2) summer is than v-notch impact property: target: test temperature-20 ℃, and the ballistic work mean value 〉=200J of 10 * 10 * 55mm sample, shear area is single 〉=and 80%, average 〉=90%.50%FATT≤-60 ℃; (3) DWTT (Drop-Weight Tear Test (DWTT)) performance: target: test temperature-15 ℃, average shear area SA% 〉=85%, single SA% 〉=70%; (4) horizontal cold-bending property: target: d=2a (d is a bending diameter, and a is a steel plate thickness) is 180 °, intact.
Description of drawings:
Accompanying drawing is metallographic structure figure of the present invention
Embodiment:
The chemical ingredients of embodiment 1-6 sees Table 2
● table 2 chemical ingredients wt%:
| Element | C | Mn | Si | S * | P | Nb | Ti | Cu | Ni | Mo | Cr | Alt | N | V | B |
| 1 | 0.055 | 2.00 | 0.21 | 0.0030 | 0.012 | 0.045 | 0.018 | 0.25 | 0.25 | 0.10 | 0.25 | 0.020 | 0.0038 | 0.10 | - |
| 2 | 0.065 | 2.00 | 0.30 | 0.0009 | 0.012 | 0.045 | 0.021 | 0.30 | 0.30 | 0.30 | - | 0.054 | 0.0040 | - | 0.0018 |
| 3 | 0.016 | 2.45 | 0.25 | 0.0020 | 0.014 | 0.145 | 0.008 | - | - | 0.55 | - | 0.035 | 0.0045 | - | - |
| 4 | 0.030 | 2.20 | 0.35 | 0.0020 | 0.012 | 0.090 | 0.026 | 0.25 | 0.3 | 0.35 | - | 0.033 | 0.0050 | 0.08 | 0.0010 |
| 5 | 0.040 | 1.80 | 0.20 | 0.0020 | 0.012 | 0.060 | 0.026 | - | 1.45 | 0.30 | - | 0.031 | 0.0085 | - | - |
| 6 | 0.080 | 1.80 | 0.48 | 0.0020 | 0.012 | 0.046 | 0.016 | 0.27 | 0.26 | 0.35 | - | 0.041 | 0.0040 | - | - |
| The present invention | 0.015～ 0.080 | 1.80～ 2.50 | ≤0.6 | ≤ 0.0030 | ≤ 0.015 | 0.040～ 0.150 | 0.005 0.030 | ≤ 0.50 | ≤ 1.50 | 0.20～ 0.60 | ≤ 1.0 | ≤ 0.060 | ≤ 0.010 | ≤0.12 | ≤ 0.0020 |
● the hot rolling technology design
(1) slab heating temperature: 1100～1250 ℃;
(2) the rolling final temperature of recrystallization zone controlled rolling: 900～1060 ℃;
(3) the rolling beginning temperature of non-recrystallization zone controlled rolling: 800～900 ℃;
(4) stop rolling temperature: 720～880 ℃;
(5) stop cooling temperature: 200～500 ℃;
(6) speed of cooling: 3～30 ℃/s.
● results of property: the metallographic structure of hot-rolled sheet of the present invention is bainite+acicular ferrite+second phase constitution, with reference to accompanying drawing.
Carry out mechanics stretching, summer ratio impact, DWTT experiment respectively, experimental result is as shown in table 3.
Table 3 trial-production coiled sheet service check result
(annotate: stretch, impact to horizontal; The tension specimen diameter is 10mm, gauge length 50.8mm; Charpy bar is of a size of 10 * 10 * 55mm; Laterally clod wash d=2a is 180 °, intact; )
Estimate feasibility and prospect that invention is applied:
Market outlook: the length of oil and gas is carried apart from pressure piping the pipe line steel performance has been proposed more strict requirement.From considering the pipe-line construction and the economy of operation, the stability and the security of operation, intensity, the toughness of pipeline steel are all had higher requirement.Under the same transport condition, use the wall thickness reduction that higher grade of steel pipe line steel product can make steel pipe, save steel using amount, or under the constant condition of pipe diameter, wall thickness, improve transfer pressure, reach the purpose that improves operational throughput.For example the comparable X70 grade of steel of the pipe line steel intensity of X80 grade of steel has improved 12%, and the X100 grade of steel has improved 20% than X80 grade of steel.Therefore, the pipe line steel grade of steel improve constantly the development trend that becomes pipe line steel, the long superstrength pipeline welded tube of using X100 and the above grade of steel of X100 apart from the high-pressure delivery natural gas line is the direction of present international pipeline industry and metallurgical industry common development.The embodiment that carries out according to the present invention can estimate this invention under the situation that appointed condition allows, and production operation is more easily carried out, and has certain possibility of applying.Especially in recent years the variation of energy structure and to the growth of energy demand has promoted developing rapidly of oil and gas pipeline industry, and long the conveying apart from pressure piping become one of principal character of pipe-line today.The ultrahigh-intensity high-toughness pipe line steel becomes the inexorable trend of pipe line steel development.Therefore, ultrahigh-intensity high-toughness X100 pipe line steel has bigger application prospect.
Claims (1)
1. superhigh strength X 100 pipeline steel, it is characterized in that: the weight percent proportioning of its moiety is: C:0.016%, Mn:1.80～2.50%, Si :≤0.6%, S :≤0.0030%, P :≤0.015%, Nb:0.145%, Ti:0.005～0.030%, V :≤0.120%, Alt :≤0.060%, N :≤0.010%, 0 :≤0.006%, Mo:0.10～0.60%, Cu: Ni≤0.50%: Cr≤1.50% :≤1.0%, B :≤0.0020%, Ca.≤0.01%, all the other are iron and inevitable impurity; This pipe line steel manufacturing technology steps comprises: get the raw materials ready, carry out converter or electrosmelting, external refining, casting, slab reheat, controlled rolling, controlled chilling then by said ratio, slab heating temperature is controlled at: 1100～1250 ℃; Controlled rolling rolling final temperature in recrystallization zone is controlled at: 900～1060 ℃; Controlled rolling rolling beginning temperature in non-recrystallization zone is controlled at: 800～900 ℃; The termination rolling temperature is controlled at: 720～880 ℃; The termination cooling temperature is controlled at: 200～500 ℃; Speed of cooling is controlled at: 3～30 ℃/s.
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